THE BUILDING OF AN ISLAND. 2/ 



by the valley of the watercourse crossing the Central plain from the north- 

 west and joining the Bethlehem watercourse to the south of the residence. Into 

 these three hills the dip of tlie strata making up the iiill last described does 

 not extend. 



Fir,. 12. 



cwmut 



.\~_^- --^^Z} Sfoirt 



Section Across Barren Spot \'allev. 

 The dotted lines indicate position of strata presumed to liave been removed. 



Starting from the east we find in the first of the three hills (a long low hill 

 on Bethlehem estate, south of the hill above mentioned), and in the second, 

 (the hill at Adventure) that the rocks dip to the southeast, while in the third 

 (the hill at Mt. Pleasant) the rocks dip to the .south, not, however, as a con- 

 tinuation of the southerly dip already mentioned, from which it is clearly 

 isolated. The probable explanation of these facts is, that an axis of elevation 

 passes through the northwestern block of hills from northwest to southeast, 

 and is continued towards the southeast between the hill at Mt. Pleasant and 

 that at Adventure, throwing tlie rocks off on either hand. Thus the rocks on 

 the northeast side of the axis form a slope towards the rucks of the Mt. Eagle 

 anticlinal, which they meet apparently in a synclinal axis that pretty nearly 

 follows the line of the Golden Grove watercourse. It 'is noteworthy that 

 while the hill at Adventure shews dips to the southeast, its southern end (at 

 Negro Bay mill-tower) shews a southern dip as in the strata at Mt. Pleasant. 

 It is this interesting fact which suggests the direction of the supposed anti- 

 clinal axis as being from northwest to southeast, the suggestion being 

 strengthened by the way in which the water is thrown off by the northwestern 

 block of hills, namely, to the southeast on the eastern side of the block, and to 

 the south on its southern side. 



The Limestone FoK^rATION in the Plain.s. 



With this survey of the four small hills in the south-central part of the 

 island our study of the hilly portion of the limestone and marl formation closes. 

 The surface of the rest consists of valleys and plains, namely, first the valleys 

 between the hills, then a part of the Central Plain, and lastly, the whole coast 

 plain stretching westwards along- the southern shore and along the western 

 shore to a little north of Frederiksted. 



In the Central Plain the formation is covered by debris from the older 

 rocks, forming gravelly and clay soils, and masses of debris below these -soils, 



